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Fried Erich; Grätzer George A.: Generalized congruences and products of lattice varieties. In: Acta scientiarum mathematicarum, (54) 1-2. pp. 21-36. (1990)
Fried Erich; Pálfy Péter Pál: On a problem of Baldwin and Berman. In: Acta scientiarum mathematicarum, (49). pp. 101-106. (1985)
Fried Erich; Pixley Alden F.: The dual discriminator function in universal algebra. In: Acta scientiarum mathematicarum, (41) 1-2. pp. 83-100. (1979)
Fried Erich; Sichler Jiří: On automorphism groups of subalgebras of a universal algebra. In: Acta scientiarum mathematicarum, (40) 3-4. pp. 265-270. (1978)
Fried Erich; Grätzer George A.: On automorphisms of the subalgebra lattice induced by automorphisms of the algebra. In: Acta scientiarum mathematicarum, (40) 1-2. pp. 49-52. (1978)
Fried Erich: A note on congruence extension property. In: Acta scientiarum mathematicarum, (40) 3-4. pp. 261-263. (1978)
Fried Erich: Equational classes which cover the class of distributive lattices. In: Acta scientiarum mathematicarum, (37) 1-2. pp. 37-40. (1975)
